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Z home problem

Discussion in 'Troubleshooting' started by cnr141, Sep 24, 2014.

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  1. cnr141

    cnr141 Member

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    i have this *hit often, and sometimes it dissappears after i switch off / on the machine.

    but whats the real reson of it.. PLS help i am about to through Robo out form window soon.

     
    #1 cnr141, Sep 24, 2014
  2. Ziggy

    Ziggy Moderator
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    If you are referring to the x and y homing, then moving back a few mm, then homing again, that is normal behaviour.

    The firmware does this to make sure the x and y are homed correctly.
     
    #2 Ziggy, Sep 24, 2014
  3. cnr141

    cnr141 Member

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    No, i just click on home all button then that happens.

    i ll check the switches.. maybe one of them wrecked or sth.
     
    #3 cnr141, Sep 24, 2014
  4. Ziggy

    Ziggy Moderator
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    The homing of X and Y in your video looks completely normal.

    Maybe I haven't understood what your problem is?

    If you are saying the Z is not homing, then that could be because the firmware thinks the Z endstop is hit all the time.

    Move the extruder away from all the endstops, then enter the gcode command M119 and check what the endstop status says.
     
    #4 Ziggy, Sep 24, 2014
  5. cnr141

    cnr141 Member

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    when the extruder is on the switch it says Z min triggered. i ll try your way too
     
    #5 cnr141, Sep 24, 2014
  6. Ziggy

    Ziggy Moderator
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    What you have described suggests there is a problem with the Z Switch(s) or the wiring between the Z switches and the Ramps board. You will need to check the wiring end to end and make sure the connection to the Ramps is correct.

    This is a good reference site for the Ramps wiring and connections

    http://reprap.org/wiki/RAMPS_1.4
     
    #6 Ziggy, Sep 24, 2014
  7. cnr141

    cnr141 Member

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    still says Z min triggered even if i hold the extruder up of the swiches.
    sth good or bad?

    checked the wires , they are OK.

    reflash the firmware auto_level_7_17

    what else should i do?
     
    #7 cnr141, Sep 25, 2014
    Last edited by a moderator: Sep 25, 2014
  8. Ziggy

    Ziggy Moderator
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    Well we need to systematically isolate where the Z problem is. Do you have and know how to use a multimeter?

    If so, disconnect the Z endstop wires from the ramps board. Then use your multimeter to connect to the endstop wires and check you can see the switch(s) open and close when you move the Z switch(s) by hand.

    By the way do you have the standard Robo auto leveling Z switches or the Mike Kelly version?
     
    #8 Ziggy, Sep 25, 2014
  9. cnr141

    cnr141 Member

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    i dont have now but i ll buy one today and will check as you said.. and will let you know about it.

    so what is gonna be the next step after i check the swicths ?
     
    #9 cnr141, Sep 25, 2014
  10. Ziggy

    Ziggy Moderator
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    If the switches and wiring is okay then either the connection to the ramps is faulty or there is a faulty ramps board.

    But it could also be an intermittent problem in the connection between the ramps and the arduino boards.

    Most likely you have faulty z switch wiring - so check that first
     
    #10 Ziggy, Sep 25, 2014
  11. cnr141

    cnr141 Member

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    Ok thanks, i ll let you know about it soon.
     
    #11 cnr141, Sep 25, 2014
  12. cnr141

    cnr141 Member

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    i have these switch. and have the multimeter but cant see anything when i touch the wires. it shows as below and goes to zero when i push up by hand.
     

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    #12 cnr141, Sep 25, 2014
  13. Mike Kelly

    Mike Kelly Volunteer

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    pierce the insulation until you measure the resistance across the two pins.

    Your system is seeing a closed circuit, so somewhere it is closed.

    Btw if you uplug the z min endstop from the ramps board, and send M119, does it show as open?
     
    #13 Mike Kelly, Sep 25, 2014
  14. cnr141

    cnr141 Member

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    m checking.. it says open now.
     
    #14 cnr141, Sep 25, 2014
  15. Mike Kelly

    Mike Kelly Volunteer

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    ok so test the switches now and report back with your findings.
     
    #15 Mike Kelly, Sep 25, 2014
    Last edited by a moderator: Sep 25, 2014
  16. Ziggy

    Ziggy Moderator
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    I notice in your photo you have the multimeter set to DC Volts (DCV) it needs to be set so it measures resistance
     
    #16 Ziggy, Sep 25, 2014
  17. Mike Kelly

    Mike Kelly Volunteer

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    #17 Mike Kelly, Sep 25, 2014
  18. cnr141

    cnr141 Member

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    both switchs shows almost 1.31 on 20k and turns to zero when i push the extruder up. But i dont know what i do.. m not good and electronics :(
     

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    #18 cnr141, Sep 25, 2014
  19. Mike Kelly

    Mike Kelly Volunteer

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    0 is an open circuit. A closed circuit should report back as infinite resistance, though any resistance is alright I think.

    What we're trying to determine here is if your switch is operating. You know how a switch works right? When the button is pressed on it, it should go to 0 or an open circuit.
     
    #19 Mike Kelly, Sep 25, 2014
  20. cnr141

    cnr141 Member

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    yes i do know how it works but.. my mind can not catch why a machine cant work the day after without doing anything...

    It was working yesterday.. i didtn do sth but now it doesnt work ..Isnt it strange?
     
    #20 cnr141, Sep 25, 2014
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